/*
 * Copyright (c) 2025, 2025, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.oracle.svm.hosted.webimage.wasm.codegen;

import java.util.Objects;

import com.oracle.svm.hosted.webimage.wasm.ast.Instructions;

public final class WasmBlockContext {

    /**
     * Instructions in this block.
     */
    protected final Instructions currentBlock;

    public final WasmBlockContext parent;

    /**
     * Label identifying this block (can be null).
     */
    protected final Object label;

    private WasmBlockContext(Instructions currentBlock, WasmBlockContext parent, Object label) {
        this.currentBlock = currentBlock;
        this.parent = parent;
        this.label = label;
    }

    public static WasmBlockContext getTopLevel(Instructions topLevelBlock) {
        return new WasmBlockContext(topLevelBlock, null, null);
    }

    public WasmBlockContext getChildContext(Instructions newBlock, Object childLabel) {
        return new WasmBlockContext(newBlock, this, childLabel);
    }

    public boolean checkLabel(Object expected) {
        assert Objects.equals(label, expected) : label + " != " + expected;
        return true;
    }
}
